Deepvoid Slave.

[neorei]

you don't need to move at all, all the tanks has to do is be in the top area,

[YuriSan]

you don't need to move at all, all the tanks has to do is be in the top area,

I liked this drawing sooooooooooooooooo much!!!!! (no sarcasm)

[Gerrr]

you don't need to move at all, all the tanks has to do is be in the top area,

You should totally make game guides! I love this drawing!! (not being sarcastic, really, its very clear!)

[Katella_Avenlea]

you don't need to move at all, all the tanks has to do is be in the top area,

This was exactly the way the group I went with not too long ago used. We had 2 whitemages and a War Tank I believe. It went off without much of a hitch. Someone specific watched the ghosts and had a macro to let everyone else know when to move up or down. Tank stayed put. It was only a month ago so I don't believe it is an "outdated tactic"
hope that helps.